On Tue, Mar 15, 2022 at 04:06:31PM +0100, Marco Davids (SIDN) via Linuxptp-users wrote: > I have a setup with an interface being a PTP client (HW timestamping, a nice > Meinberg GM and such) and phc2sys supplying time from it to another > interface's PHC in the same server. > > Is there anything to be said about the accuracy/precision on the second > interface's PHC with this approach?
The answer is, "it depends". The timestamps used by phc2sys are SW, and a busy system might preempt phc2sys a just the wrong times, causing time error. You a can mitigate by using a preempt_rt kernel and giving phc2sys sched_fifo priority. You can force artificial system load using `hackbench` `stress` and friends. You can characterize your performance by measuring end to end, like from a PPS from a client on the second port back to the Meinberg's PPS. HTH, Richard _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
